JPH0596971U - Tape cassette - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the upper and lower cases of the tape cassette are made of crystalline resin, the upper and lower cases are properly and firmly connected. [Configuration] provided a cylindrical projection 3 ₁ with through-holes 6 to either one of the upper and lower cases 1 and 2, the annular boss 3 in contact with the tubular projections 3 ₁ is provided on the opponent case, the annular boss 3 A pin 4 is provided so as to protrude from the center, and the tip of the pin 4 is provided with an annular boss
Of the cylindrical boss 3 ₁
Since the pin 4 is fitted into the through hole 6 and integrally connected by fusion caulking, the upper and lower cases can be joined together even in a crystalline resin case, and the case can withstand twisting and drop impact. , Can be used safely without adversely affecting the recording / reproducing medium, and can improve quality and remarkably improve assemblability and reliability.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tape cassette such as a video cassette or a digital audio tape (DAT) in which a recording medium, for example, a tape-shaped medium is housed in a case.

[0002]

[Prior Art]

 In general, the information media of video cassettes are easily protected from dust and dust during handling, and are therefore protected by being stored in a synthetic resin case. ) Or PS resin (polystyrene resin) PC resin (polycarbonate resin) or PP resin (polypropylene resin), etc., and an upper case and a lower case are welded and bonded at the welded portion. ing.

[0003]

[Problems to be solved by the device]

 In the conventional video cassette, the case for storing the media has welding protrusions on the upper and lower cases respectively, and welding ribs are provided on the mating surface of both protrusions or the mating surface of the outer peripheral wall of the case. Since the crystalline resin requires strong energy to melt when it is welded, it may be difficult to weld due to the relationship between the joint surface and the welding rib. There is a tendency for the shearing force to be weak, and there is a risk that the upper and lower cases may separate due to the case twisting or drop impact, which reduces the product value and poses a reliability problem. The present invention is intended to eliminate these conventional drawbacks. Even in the case of a crystalline resin, the upper and lower cases are firmly joined together, and the tape cassette can withstand twisting and drop impact of the case and is highly reliable and reliable. The purpose is to provide a simple and inexpensive configuration.

[0004]

According to the present invention, a synthetic resin case for accommodating a tape-shaped medium comprises an upper case and a lower case made of a crystalline synthetic resin, and an upper case and a lower case are integrally connected by a connecting portion. In the set, a cylindrical protrusion having a through hole is provided in either one of the upper and lower cases, an annular boss that comes into contact with the cylindrical protrusion is provided in the mating case, and a pin is protruded at the center of the annular boss. In the tape cassette, the tip of the pin is provided so as to project from the end surface of the annular boss, the annular boss is in contact with the cylindrical projection, the pin is inserted into the through hole, and the pins are integrally connected by fusion caulking.

[0005]

[Action]

When the upper and lower cases 1 and 2 are combined to weld and integrate the upper and lower cases with a welding horn, one case, for example, an annular boss 3 provided with a pin 4 protruding from the lower case and the upper case 1 are protruded. The cylindrical projection 3 ₁ of the joined portion is abutted, the pin 4 is fitted into the through hole 6, and the tip of the pin 4 is integrally connected to the cylindrical projection 3 ₁ by melting caulking, so that the joined state is strong. In addition, it is resistant to shearing forces in the front, rear, left and right sides of the case, improves weldability, and reduces the vibration energy required for welding, resulting in a highly reliable tape cassette.

[0006]

【Example】

An embodiment of the present invention will be described with reference to FIGS. 1 to 5. A case using a crystalline resin such as a polypropylene resin, a polyethylene resin or a polyamide resin is composed of an upper case 1 and a lower case 2, and the upper and lower cases are In order to store the tape-shaped medium by welding, a cylindrical projection 3 ₁ having a through hole 6 is provided in either one of the upper and lower cases 1, 2 and an annular boss that abuts the cylindrical projection 3 _1. 3 with the provision of the mating case, by projecting the pin 4 in the center of the annular boss 3, the tip of the pin 4 deployed protrudes from the end face of the annular boss 3, the annular boss 3 a cylindrical projection 3 ₁ And the pin 4 is fitted into the through hole 6 and integrally connected by melt caulking to form a tape cassette.

The hollow cylindrical protrusion 3 ₁ having the through hole 6 and the annular boss 3 abutting the cylindrical protrusion 3 ₁ are divided into a partition rib 5 for partitioning the storage area 10 of the tape 11 and an outer wall of the case. Although the protrusions that are placed facing the case corners between them are used, it is the cassette half that chooses the four corners and the center of the case other than the medium storage area, which is the same position as the conventional tapping position. The overall balance and rigidity are good, and it is effective without any visual defects due to protrusions after welding.

The cylindrical projection 3 may be a hollow cylindrical body, and a ring-shaped welding rib may be projectingly provided on the top surface. Further, in the case consisting of the upper case 1 and the lower case 2, a tape 11 is wound around a pair of rotatably provided tape reels 12 and 12, and a front lid 13 for opening and closing the case opening is provided. The rear lid 14 is rotatably provided to form a tape cassette.

In this embodiment, the annular boss 3 and the protrusion 3 ₁ may be formed as a hollow cylindrical body as a connecting portion, and a ring-shaped or intermittently annularly arranged welding rib may be provided on the top surface of the protrusion. The hollow portion 7 of the hollow cylindrical body may be fixed by a molten caulking portion 8 formed by a pin 4 to provide a positioning function, and this fitting structure is used for a temporary fixing function to improve the accuracy of the welding process. It is good to improve workability.

[0010]

[Effect of the device]

 According to the present invention, a synthetic resin case for accommodating a tape-shaped medium is composed of an upper case and a lower case made of crystalline synthetic resin, and the upper and lower cases are integrally connected by a connecting portion. A cylindrical protrusion having a through hole is provided on one side, an annular boss that abuts the cylindrical protrusion is provided on the mating case, and a pin is provided at the center of the annular boss so that the tip of the pin is the end face of the annular boss. By further projecting, the annular boss is in contact with the cylindrical protrusion, and the pin is inserted into the through hole and integrally connected by fusion caulking, so that the upper and lower cases are firmly connected even in the case of crystalline resin. It is possible to perform proper assembling work and simplification of assembling work, and it can withstand twisting and drop impact on the case, and can be used safely without adversely affecting the characteristics of the recording / reproducing medium. High quality It the assembling property and reliability can be remarkably improved, there is a practical effect of such is high because even the commercial value.

[Brief description of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention in a use state.

FIG. 2 is a perspective view of the example of FIG. 1 in a separated state.

FIG. 3 is an enlarged perspective view of a part of the upper and lower cases in a separated state.

4 is an enlarged vertical cross-sectional view of a portion of the example of FIG. 3 before being joined to the case.

FIG. 5 is an enlarged vertical cross-sectional view of a part of the conventional case in a case-joined state.

[Explanation of symbols]

1 Upper case 2 Lower case 3 Annular boss 3 ₁ Cylindrical protrusion 4 Pin 5 Partition rib 6 Through hole 7 Hollow part 8 Melt caulking part 11 Tape 12 Tape reel 13 Front lid

Claims (2)

[Scope of utility model registration request] 1. A tape cassette in which a synthetic resin case for accommodating a tape-shaped medium comprises an upper case and a lower case made of a crystalline synthetic resin, and the upper and lower cases are integrally connected by a connecting portion. A cylindrical protrusion having a through hole is provided on one side, and an annular boss that comes into contact with the cylindrical protrusion is provided on the mating case, and a pin is provided at the center of the annular boss so that the tip of the pin is A tape cassette characterized in that the tape boss is provided so as to project from the end face, the annular boss is in contact with a cylindrical projection, and the pin is fitted into a through hole and integrally connected by melt caulking. 2. The tape cassette according to claim 1, wherein the case is made of polypropylene resin, and the coupling portion is arranged outside the storage area for the tape-shaped medium.